diff --git a/node/log_entry_sync/src/sync_manager/log_entry_fetcher.rs b/node/log_entry_sync/src/sync_manager/log_entry_fetcher.rs
index a3ead52..a1c6dbc 100644
--- a/node/log_entry_sync/src/sync_manager/log_entry_fetcher.rs
+++ b/node/log_entry_sync/src/sync_manager/log_entry_fetcher.rs
@@ -122,7 +122,7 @@ impl LogEntryFetcher {
     pub fn start_remove_finalized_block_task(
         &self,
         executor: &TaskExecutor,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
         block_hash_cache: Arc<RwLock<BTreeMap<u64, Option<BlockHashAndSubmissionIndex>>>>,
         default_finalized_block_count: u64,
         remove_finalized_block_interval_minutes: u64,
@@ -133,7 +133,7 @@ impl LogEntryFetcher {
                 loop {
                     debug!("processing finalized block");
 
-                    let processed_block_number = match store.read().await.get_sync_progress() {
+                    let processed_block_number = match store.get_sync_progress() {
                         Ok(Some((processed_block_number, _))) => Some(processed_block_number),
                         Ok(None) => None,
                         Err(e) => {
@@ -176,9 +176,7 @@ impl LogEntryFetcher {
                                 }
 
                                 for key in pending_keys.into_iter() {
-                                    if let Err(e) =
-                                        store.write().await.delete_block_hash_by_number(key)
-                                    {
+                                    if let Err(e) = store.delete_block_hash_by_number(key) {
                                         error!(
                                             "remove block tx for number {} error: e={:?}",
                                             key, e
diff --git a/node/log_entry_sync/src/sync_manager/mod.rs b/node/log_entry_sync/src/sync_manager/mod.rs
index ebcbc85..c074d92 100644
--- a/node/log_entry_sync/src/sync_manager/mod.rs
+++ b/node/log_entry_sync/src/sync_manager/mod.rs
@@ -33,7 +33,7 @@ pub enum LogSyncEvent {
 pub struct LogSyncManager {
     config: LogSyncConfig,
     log_fetcher: LogEntryFetcher,
-    store: Arc<RwLock<dyn Store>>,
+    store: Arc<dyn Store>,
     data_cache: DataCache,
 
     next_tx_seq: u64,
@@ -48,9 +48,9 @@ impl LogSyncManager {
     pub async fn spawn(
         config: LogSyncConfig,
         executor: TaskExecutor,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
     ) -> Result<broadcast::Sender<LogSyncEvent>> {
-        let next_tx_seq = store.read().await.next_tx_seq();
+        let next_tx_seq = store.next_tx_seq();
 
         let executor_clone = executor.clone();
         let mut shutdown_sender = executor.shutdown_sender();
@@ -81,8 +81,6 @@ impl LogSyncManager {
 
                     let block_hash_cache = Arc::new(RwLock::new(
                         store
-                            .read()
-                            .await
                             .get_block_hashes()?
                             .into_iter()
                             .map(|(x, y)| (x, Some(y)))
@@ -124,7 +122,7 @@ impl LogSyncManager {
                     // TODO(zz): Handle reorg instead of return.
                     let mut need_handle_reorg = false;
                     let (mut start_block_number, mut start_block_hash) =
-                        match log_sync_manager.store.read().await.get_sync_progress()? {
+                        match log_sync_manager.store.get_sync_progress()? {
                             // No previous progress, so just use config.
                             None => {
                                 let block_number = log_sync_manager.config.start_block_number;
@@ -176,7 +174,7 @@ impl LogSyncManager {
                         log_sync_manager.handle_data(reorg_rx).await?;
 
                         if let Some((block_number, block_hash)) =
-                            log_sync_manager.store.read().await.get_sync_progress()?
+                            log_sync_manager.store.get_sync_progress()?
                         {
                             start_block_number = block_number;
                             start_block_hash = block_hash;
@@ -301,7 +299,7 @@ impl LogSyncManager {
     async fn process_reverted(&mut self, tx_seq: u64) {
         warn!("revert for chain reorg: seq={}", tx_seq);
         {
-            let store = self.store.read().await;
+            let store = self.store.clone();
             for seq in tx_seq..self.next_tx_seq {
                 if matches!(store.check_tx_completed(seq), Ok(true)) {
                     if let Ok(Some(tx)) = store.get_tx_by_seq_number(seq) {
@@ -325,7 +323,7 @@ impl LogSyncManager {
         let _ = self.event_send.send(LogSyncEvent::ReorgDetected { tx_seq });
 
         // TODO(zz): `wrapping_sub` here is a hack to handle the case of tx_seq=0.
-        if let Err(e) = self.store.write().await.revert_to(tx_seq.wrapping_sub(1)) {
+        if let Err(e) = self.store.revert_to(tx_seq.wrapping_sub(1)) {
             error!("revert_to fails: e={:?}", e);
             return;
         }
@@ -353,7 +351,7 @@ impl LogSyncManager {
                         );
                     }
 
-                    self.store.write().await.put_sync_progress((
+                    self.store.put_sync_progress((
                         block_number,
                         block_hash,
                         first_submission_index,
@@ -396,12 +394,12 @@ impl LogSyncManager {
     }
 
     async fn put_tx_inner(&mut self, tx: Transaction) -> bool {
-        if let Err(e) = self.store.write().await.put_tx(tx.clone()) {
+        if let Err(e) = self.store.put_tx(tx.clone()) {
             error!("put_tx error: e={:?}", e);
             false
         } else {
             if let Some(data) = self.data_cache.pop_data(&tx.data_merkle_root) {
-                let store = self.store.write().await;
+                let store = self.store.clone();
                 // We are holding a mutable reference of LogSyncManager, so no chain reorg is
                 // possible after put_tx.
                 if let Err(e) = store
diff --git a/node/miner/src/loader.rs b/node/miner/src/loader.rs
index 92b7397..e8952d4 100644
--- a/node/miner/src/loader.rs
+++ b/node/miner/src/loader.rs
@@ -9,10 +9,9 @@ pub trait PoraLoader: Send + Sync {
 }
 
 #[async_trait]
-impl PoraLoader for Arc<RwLock<dyn Store>> {
+impl PoraLoader for Arc<dyn Store> {
     async fn load_sealed_data(&self, chunk_index: u64) -> Option<MineLoadChunk> {
-        let store = &*self.read().await;
-        match store.flow().load_sealed_data(chunk_index) {
+        match self.flow().load_sealed_data(chunk_index) {
             Ok(Some(chunk)) => Some(chunk),
             _ => None,
         }
diff --git a/node/miner/src/miner_id.rs b/node/miner/src/miner_id.rs
index 7b50dcc..20a1379 100644
--- a/node/miner/src/miner_id.rs
+++ b/node/miner/src/miner_id.rs
@@ -21,11 +21,11 @@ fn set_miner_id(store: &dyn Store, miner_id: &H256) -> storage::error::Result<()
 
 pub(crate) async fn check_and_request_miner_id(
     config: &MinerConfig,
-    store: &RwLock<dyn Store>,
+    store: &dyn Store,
     provider: &Arc<MineServiceMiddleware>,
 ) -> Result<H256, String> {
-    let db_miner_id = load_miner_id(&*store.read().await)
-        .map_err(|e| format!("miner_id on db corrupt: {:?}", e))?;
+    let db_miner_id =
+        load_miner_id(store).map_err(|e| format!("miner_id on db corrupt: {:?}", e))?;
 
     let mine_contract = PoraMine::new(config.mine_address, provider.clone());
 
@@ -42,7 +42,7 @@ pub(crate) async fn check_and_request_miner_id(
         }
         (None, Some(c_id)) => {
             check_miner_id(&mine_contract, c_id).await?;
-            set_miner_id(&*store.write().await, &c_id)
+            set_miner_id(store, &c_id)
                 .map_err(|e| format!("set miner id on db corrupt: {:?}", e))?;
             Ok(c_id)
         }
@@ -53,8 +53,7 @@ pub(crate) async fn check_and_request_miner_id(
         (None, None) => {
             let beneficiary = provider.address();
             let id = request_miner_id(&mine_contract, beneficiary).await?;
-            set_miner_id(&*store.write().await, &id)
-                .map_err(|e| format!("set miner id on db corrupt: {:?}", e))?;
+            set_miner_id(store, &id).map_err(|e| format!("set miner id on db corrupt: {:?}", e))?;
             Ok(id)
         }
     }
diff --git a/node/miner/src/sealer.rs b/node/miner/src/sealer.rs
index 59390d4..0500f3c 100644
--- a/node/miner/src/sealer.rs
+++ b/node/miner/src/sealer.rs
@@ -22,7 +22,7 @@ const CHAIN_STATUS_QUERY_PERIOD: u64 = 5;
 
 pub struct Sealer {
     flow_contract: ZgsFlow<MineServiceMiddleware>,
-    store: Arc<RwLock<dyn Store>>,
+    store: Arc<dyn Store>,
     context_cache: BTreeMap<u128, EpochRangeWithContextDigest>,
     last_context_flow_length: u64,
     miner_id: H256,
@@ -32,7 +32,7 @@ impl Sealer {
     pub fn spawn(
         executor: TaskExecutor,
         provider: Arc<MineServiceMiddleware>,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
         config: &MinerConfig,
         miner_id: H256,
     ) {
@@ -152,19 +152,11 @@ impl Sealer {
 
     async fn fetch_task(&self) -> Result<Option<Vec<SealTask>>> {
         let seal_index_max = self.last_context_flow_length as usize / SECTORS_PER_SEAL;
-        self.store
-            .read()
-            .await
-            .flow()
-            .pull_seal_chunk(seal_index_max)
+        self.store.flow().pull_seal_chunk(seal_index_max)
     }
 
     async fn submit_answer(&self, answers: Vec<SealAnswer>) -> Result<()> {
-        self.store
-            .write()
-            .await
-            .flow_mut()
-            .submit_seal_result(answers)
+        self.store.flow().submit_seal_result(answers)
     }
 
     async fn seal_iteration(&mut self) -> Result<bool> {
diff --git a/node/miner/src/service.rs b/node/miner/src/service.rs
index d31ad88..b96a143 100644
--- a/node/miner/src/service.rs
+++ b/node/miner/src/service.rs
@@ -29,13 +29,13 @@ impl MineService {
         executor: task_executor::TaskExecutor,
         _network_send: mpsc::UnboundedSender<NetworkMessage>,
         config: MinerConfig,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
     ) -> Result<broadcast::Sender<MinerMessage>, String> {
         let provider = Arc::new(config.make_provider().await?);
 
         let (msg_send, msg_recv) = broadcast::channel(1024);
 
-        let miner_id = check_and_request_miner_id(&config, &store, &provider).await?;
+        let miner_id = check_and_request_miner_id(&config, store.as_ref(), &provider).await?;
         debug!("miner id setting complete.");
 
         let mine_context_receiver = MineContextWatcher::spawn(
diff --git a/node/miner/src/submitter.rs b/node/miner/src/submitter.rs
index ad76b5c..753fb8f 100644
--- a/node/miner/src/submitter.rs
+++ b/node/miner/src/submitter.rs
@@ -22,7 +22,7 @@ pub struct Submitter {
     mine_contract: PoraMine<MineServiceMiddleware>,
     flow_contract: ZgsFlow<MineServiceMiddleware>,
     default_gas_limit: Option<U256>,
-    store: Arc<RwLock<dyn Store>>,
+    store: Arc<dyn Store>,
 }
 
 impl Submitter {
@@ -30,7 +30,7 @@ impl Submitter {
         executor: TaskExecutor,
         mine_answer_receiver: mpsc::UnboundedReceiver<AnswerWithoutProof>,
         provider: Arc<MineServiceMiddleware>,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
         config: &MinerConfig,
     ) {
         let mine_contract = PoraMine::new(config.mine_address, provider.clone());
@@ -80,8 +80,6 @@ impl Submitter {
 
         let flow_proof = self
             .store
-            .read()
-            .await
             .get_proof_at_root(
                 &mine_answer.context_flow_root,
                 mine_answer.recall_position,
diff --git a/node/pruner/src/lib.rs b/node/pruner/src/lib.rs
index 8e1cf0d..914443a 100644
--- a/node/pruner/src/lib.rs
+++ b/node/pruner/src/lib.rs
@@ -32,7 +32,7 @@ impl PrunerConfig {
 
 pub struct Pruner {
     config: PrunerConfig,
-    store: Arc<RwLock<dyn Store>>,
+    store: Arc<dyn Store>,
 
     sender: mpsc::UnboundedSender<PrunerMessage>,
     miner_sender: Option<broadcast::Sender<MinerMessage>>,
@@ -42,10 +42,10 @@ impl Pruner {
     pub async fn spawn(
         executor: TaskExecutor,
         mut config: PrunerConfig,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
         miner_sender: Option<broadcast::Sender<MinerMessage>>,
     ) -> Result<mpsc::UnboundedReceiver<PrunerMessage>> {
-        if let Some(shard_config) = get_shard_config(&store).await? {
+        if let Some(shard_config) = get_shard_config(store.as_ref()).await? {
             config.shard_config = shard_config;
         }
         let (tx, rx) = mpsc::unbounded_channel();
@@ -76,7 +76,7 @@ impl Pruner {
                     batch.push(index);
                     if batch.len() == self.config.batch_size || iter.peek().is_none() {
                         debug!(start = batch.first(), end = batch.last(), "prune batch");
-                        self.store.write().await.remove_chunks_batch(&batch)?;
+                        self.store.remove_chunks_batch(&batch)?;
                         batch = Vec::with_capacity(self.config.batch_size);
                         tokio::time::sleep(self.config.batch_wait_time).await;
                     }
@@ -87,7 +87,7 @@ impl Pruner {
     }
 
     async fn maybe_update(&mut self) -> Result<Option<Box<dyn Send + Iterator<Item = u64>>>> {
-        let current_size = self.store.read().await.flow().get_num_entries()?;
+        let current_size = self.store.flow().get_num_entries()?;
         debug!(
             current_size = current_size,
             config = ?self.config.shard_config,
@@ -109,7 +109,7 @@ impl Pruner {
             config.num_shard *= 2;
 
             // Generate delete list
-            let flow_len = self.store.read().await.get_context()?.1;
+            let flow_len = self.store.get_context()?.1;
             let start_index = old_shard_id + (!rand_bit) as usize * old_num_shard;
             return Ok(Some(Box::new(
                 (start_index as u64..flow_len).step_by(config.num_shard),
@@ -124,16 +124,16 @@ impl Pruner {
         }
         self.sender
             .send(PrunerMessage::ChangeShardConfig(self.config.shard_config))?;
-        let mut store = self.store.write().await;
-        store
-            .flow_mut()
+        self.store
+            .flow()
             .update_shard_config(self.config.shard_config);
-        store.set_config_encoded(&SHARD_CONFIG_KEY, &self.config.shard_config)
+        self.store
+            .set_config_encoded(&SHARD_CONFIG_KEY, &self.config.shard_config)
     }
 }
 
-async fn get_shard_config(store: &RwLock<dyn Store>) -> Result<Option<ShardConfig>> {
-    store.read().await.get_config_decoded(&SHARD_CONFIG_KEY)
+async fn get_shard_config(store: &dyn Store) -> Result<Option<ShardConfig>> {
+    store.get_config_decoded(&SHARD_CONFIG_KEY)
 }
 
 #[derive(Debug)]
diff --git a/node/router/src/libp2p_event_handler.rs b/node/router/src/libp2p_event_handler.rs
index 678578d..002dd1e 100644
--- a/node/router/src/libp2p_event_handler.rs
+++ b/node/router/src/libp2p_event_handler.rs
@@ -269,13 +269,7 @@ impl Libp2pEventHandler {
         };
 
         let timestamp = timestamp_now();
-        let shard_config = self
-            .store
-            .get_store()
-            .read()
-            .await
-            .flow()
-            .get_shard_config();
+        let shard_config = self.store.get_store().flow().get_shard_config();
 
         let msg = AnnounceFile {
             tx_id,
@@ -598,7 +592,7 @@ mod tests {
         sync_recv: SyncReceiver,
         chunk_pool_send: mpsc::UnboundedSender<ChunkPoolMessage>,
         chunk_pool_recv: mpsc::UnboundedReceiver<ChunkPoolMessage>,
-        store: Arc<RwLock<dyn Store>>,
+        store: Arc<dyn Store>,
         file_location_cache: Arc<FileLocationCache>,
         peers: Arc<RwLock<PeerManager>>,
     }
@@ -621,7 +615,7 @@ mod tests {
                 sync_recv,
                 chunk_pool_send,
                 chunk_pool_recv,
-                store: Arc::new(RwLock::new(store)),
+                store: Arc::new(store),
                 file_location_cache: Arc::new(FileLocationCache::default()),
                 peers: Arc::new(RwLock::new(PeerManager::new(Config::default()))),
             }
diff --git a/node/router/src/service.rs b/node/router/src/service.rs
index 0d5f4b8..f1590a2 100644
--- a/node/router/src/service.rs
+++ b/node/router/src/service.rs
@@ -58,7 +58,7 @@ impl RouterService {
         _miner_send: Option<broadcast::Sender<MinerMessage>>,
         chunk_pool_send: UnboundedSender<ChunkPoolMessage>,
         pruner_recv: Option<mpsc::UnboundedReceiver<PrunerMessage>>,
-        store: Arc<RwLock<dyn LogStore>>,
+        store: Arc<dyn LogStore>,
         file_location_cache: Arc<FileLocationCache>,
         local_keypair: Keypair,
         config: Config,
diff --git a/node/rpc/src/zgs/impl.rs b/node/rpc/src/zgs/impl.rs
index 46d7b6d..36ba47e 100644
--- a/node/rpc/src/zgs/impl.rs
+++ b/node/rpc/src/zgs/impl.rs
@@ -23,8 +23,6 @@ impl RpcServer for RpcServerImpl {
             .ctx
             .log_store
             .get_store()
-            .read()
-            .await
             .get_sync_progress()?
             .unwrap_or_default();
 
@@ -156,14 +154,7 @@ impl RpcServer for RpcServerImpl {
 
     async fn get_shard_config(&self) -> RpcResult<ShardConfig> {
         debug!("zgs_getShardConfig");
-        let shard_config = self
-            .ctx
-            .log_store
-            .get_store()
-            .read()
-            .await
-            .flow()
-            .get_shard_config();
+        let shard_config = self.ctx.log_store.get_store().flow().get_shard_config();
         Ok(shard_config)
     }
 }
diff --git a/node/src/client/builder.rs b/node/src/client/builder.rs
index 3933557..c50df97 100644
--- a/node/src/client/builder.rs
+++ b/node/src/client/builder.rs
@@ -68,7 +68,7 @@ struct ChunkPoolComponents {
 #[derive(Default)]
 pub struct ClientBuilder {
     runtime_context: Option<RuntimeContext>,
-    store: Option<Arc<RwLock<dyn Store>>>,
+    store: Option<Arc<dyn Store>>,
     async_store: Option<storage_async::Store>,
     file_location_cache: Option<Arc<FileLocationCache>>,
     network: Option<NetworkComponents>,
@@ -89,10 +89,10 @@ impl ClientBuilder {
     /// Initializes in-memory storage.
     pub fn with_memory_store(mut self) -> Result<Self, String> {
         // TODO(zz): Set config.
-        let store = Arc::new(RwLock::new(
+        let store = Arc::new(
             LogManager::memorydb(LogConfig::default())
                 .map_err(|e| format!("Unable to start in-memory store: {:?}", e))?,
-        ));
+        );
 
         self.store = Some(store.clone());
 
@@ -105,10 +105,10 @@ impl ClientBuilder {
 
     /// Initializes RocksDB storage.
     pub fn with_rocksdb_store(mut self, config: &StorageConfig) -> Result<Self, String> {
-        let store = Arc::new(RwLock::new(
+        let store = Arc::new(
             LogManager::rocksdb(LogConfig::default(), &config.db_dir)
                 .map_err(|e| format!("Unable to start RocksDB store: {:?}", e))?,
-        ));
+        );
 
         self.store = Some(store.clone());
 
diff --git a/node/storage-async/src/lib.rs b/node/storage-async/src/lib.rs
index 012d819..81eab35 100644
--- a/node/storage-async/src/lib.rs
+++ b/node/storage-async/src/lib.rs
@@ -28,14 +28,14 @@ macro_rules! delegate {
 #[derive(Clone)]
 pub struct Store {
     /// Log and transaction storage.
-    store: Arc<RwLock<dyn LogStore>>,
+    store: Arc<dyn LogStore>,
 
     /// Tokio executor for spawning worker tasks.
     executor: TaskExecutor,
 }
 
 impl Store {
-    pub fn new(store: Arc<RwLock<dyn LogStore>>, executor: TaskExecutor) -> Self {
+    pub fn new(store: Arc<dyn LogStore>, executor: TaskExecutor) -> Self {
         Store { store, executor }
     }
 
@@ -64,7 +64,7 @@ impl Store {
 
     async fn spawn<T, F>(&self, f: F) -> Result<T>
     where
-        F: FnOnce(&mut dyn LogStore) -> Result<T> + Send + 'static,
+        F: FnOnce(&dyn LogStore) -> Result<T> + Send + 'static,
         T: Send + 'static,
     {
         let store = self.store.clone();
@@ -73,7 +73,7 @@ impl Store {
         self.executor.spawn(
             async move {
                 // FIXME(zz): Not all functions need `write`. Refactor store usage.
-                let res = f(&mut *store.write().await);
+                let res = f(&*store);
 
                 if tx.send(res).is_err() {
                     error!("Unable to complete async storage operation: the receiver dropped");
@@ -87,7 +87,7 @@ impl Store {
     }
 
     // FIXME(zz): Refactor the lock and async call here.
-    pub fn get_store(&self) -> &RwLock<dyn LogStore> {
+    pub fn get_store(&self) -> &dyn LogStore {
         self.store.as_ref()
     }
 }
diff --git a/node/storage/src/log_store/flow_store.rs b/node/storage/src/log_store/flow_store.rs
index 7566078..a1c581a 100644
--- a/node/storage/src/log_store/flow_store.rs
+++ b/node/storage/src/log_store/flow_store.rs
@@ -87,7 +87,7 @@ impl FlowStore {
 #[derive(Clone, Debug)]
 pub struct FlowConfig {
     pub batch_size: usize,
-    pub shard_config: ShardConfig,
+    pub shard_config: Arc<RwLock<ShardConfig>>,
 }
 
 impl Default for FlowConfig {
@@ -208,7 +208,7 @@ impl FlowRead for FlowStore {
     }
 
     fn get_shard_config(&self) -> ShardConfig {
-        self.config.shard_config
+        self.config.shard_config.read().clone()
     }
 }
 
@@ -233,7 +233,7 @@ impl FlowWrite for FlowStore {
                 .expect("in range");
 
             let chunk_index = chunk.start_index / self.config.batch_size as u64;
-            if !self.config.shard_config.in_range(chunk_index) {
+            if !self.config.shard_config.read().in_range(chunk_index) {
                 // The data are in a shard range that we are not storing.
                 continue;
             }
@@ -273,8 +273,8 @@ impl FlowWrite for FlowStore {
         Ok(())
     }
 
-    fn update_shard_config(&mut self, shard_config: ShardConfig) {
-        self.config.shard_config = shard_config;
+    fn update_shard_config(&self, shard_config: ShardConfig) {
+        *self.config.shard_config.write() = shard_config;
     }
 }
 
@@ -313,7 +313,7 @@ impl FlowSeal for FlowStore {
         Ok(Some(tasks))
     }
 
-    fn submit_seal_result(&mut self, answers: Vec<SealAnswer>) -> Result<()> {
+    fn submit_seal_result(&self, answers: Vec<SealAnswer>) -> Result<()> {
         let mut to_seal_set = self.to_seal_set.write();
         let is_consistent = |answer: &SealAnswer| {
             to_seal_set
diff --git a/node/storage/src/log_store/mod.rs b/node/storage/src/log_store/mod.rs
index 4e0f391..e903cc6 100644
--- a/node/storage/src/log_store/mod.rs
+++ b/node/storage/src/log_store/mod.rs
@@ -213,7 +213,7 @@ pub trait FlowWrite {
     fn truncate(&self, start_index: u64) -> Result<()>;
 
     /// Update the shard config.
-    fn update_shard_config(&mut self, shard_config: ShardConfig);
+    fn update_shard_config(&self, shard_config: ShardConfig);
 }
 
 pub struct SealTask {
@@ -247,7 +247,7 @@ pub trait FlowSeal {
 
     /// Submit sealing result
 
-    fn submit_seal_result(&mut self, answers: Vec<SealAnswer>) -> Result<()>;
+    fn submit_seal_result(&self, answers: Vec<SealAnswer>) -> Result<()>;
 }
 
 pub trait Flow: FlowRead + FlowWrite + FlowSeal {}
diff --git a/node/sync/src/auto_sync/sync_store.rs b/node/sync/src/auto_sync/sync_store.rs
index 7fa8bb5..4797cca 100644
--- a/node/sync/src/auto_sync/sync_store.rs
+++ b/node/sync/src/auto_sync/sync_store.rs
@@ -29,7 +29,7 @@ impl SyncStore {
     }
 
     pub async fn get_tx_seq_range(&self) -> Result<(Option<u64>, Option<u64>)> {
-        let store = self.store.get_store().read().await;
+        let store = self.store.get_store();
 
         // load next_tx_seq
         let next_tx_seq = store.get_config_decoded(&KEY_NEXT_TX_SEQ)?;
@@ -43,8 +43,6 @@ impl SyncStore {
     pub async fn set_next_tx_seq(&self, tx_seq: u64) -> Result<()> {
         self.store
             .get_store()
-            .write()
-            .await
             .set_config_encoded(&KEY_NEXT_TX_SEQ, &tx_seq)
     }
 
@@ -52,13 +50,11 @@ impl SyncStore {
         debug!(%tx_seq, "set_max_tx_seq");
         self.store
             .get_store()
-            .write()
-            .await
             .set_config_encoded(&KEY_MAX_TX_SEQ, &tx_seq)
     }
 
     pub async fn add_pending_tx(&self, tx_seq: u64) -> Result<bool> {
-        let store = self.store.get_store().write().await;
+        let store = self.store.get_store();
 
         // already in ready queue
         if self.ready_txs.has(store.deref(), tx_seq)? {
@@ -70,7 +66,7 @@ impl SyncStore {
     }
 
     pub async fn upgrade_tx_to_ready(&self, tx_seq: u64) -> Result<bool> {
-        let store = self.store.get_store().write().await;
+        let store = self.store.get_store();
 
         let mut tx = ConfigTx::default();
 
@@ -91,7 +87,7 @@ impl SyncStore {
     }
 
     pub async fn downgrade_tx_to_pending(&self, tx_seq: u64) -> Result<bool> {
-        let store = self.store.get_store().write().await;
+        let store = self.store.get_store();
 
         let mut tx = ConfigTx::default();
 
@@ -112,7 +108,7 @@ impl SyncStore {
     }
 
     pub async fn random_tx(&self) -> Result<Option<u64>> {
-        let store = self.store.get_store().read().await;
+        let store = self.store.get_store();
 
         // try to find a tx in ready queue with high priority
         if let Some(val) = self.ready_txs.random(store.deref())? {
@@ -124,7 +120,7 @@ impl SyncStore {
     }
 
     pub async fn remove_tx(&self, tx_seq: u64) -> Result<bool> {
-        let store = self.store.get_store().write().await;
+        let store = self.store.get_store();
 
         // removed in ready queue
         if self.ready_txs.remove(store.deref(), None, tx_seq)? {
diff --git a/node/sync/src/controllers/serial.rs b/node/sync/src/controllers/serial.rs
index 9e5cc9d..b003bee 100644
--- a/node/sync/src/controllers/serial.rs
+++ b/node/sync/src/controllers/serial.rs
@@ -424,8 +424,6 @@ impl SerialSyncController {
         let validation_result = self
             .store
             .get_store()
-            .write()
-            .await
             .validate_and_insert_range_proof(self.tx_seq, &response);
 
         match validation_result {
@@ -447,13 +445,7 @@ impl SerialSyncController {
 
         self.failures = 0;
 
-        let shard_config = self
-            .store
-            .get_store()
-            .read()
-            .await
-            .flow()
-            .get_shard_config();
+        let shard_config = self.store.get_store().flow().get_shard_config();
         let next_chunk = shard_config.next_segment_index(
             (from_chunk / PORA_CHUNK_SIZE as u64) as usize,
             (self.tx_start_chunk_in_flow / PORA_CHUNK_SIZE as u64) as usize,
@@ -1107,8 +1099,6 @@ mod tests {
         );
 
         let chunks = peer_store
-            .read()
-            .await
             .get_chunks_with_proof_by_tx_and_index_range(tx_seq, 0, chunk_count)
             .unwrap()
             .unwrap();
@@ -1141,8 +1131,6 @@ mod tests {
         );
 
         let mut chunks = peer_store
-            .read()
-            .await
             .get_chunks_with_proof_by_tx_and_index_range(tx_seq, 0, chunk_count)
             .unwrap()
             .unwrap();
@@ -1210,8 +1198,6 @@ mod tests {
         );
 
         let chunks = peer_store
-            .read()
-            .await
             .get_chunks_with_proof_by_tx_and_index_range(tx_seq, 0, chunk_count)
             .unwrap()
             .unwrap();
@@ -1276,8 +1262,6 @@ mod tests {
         );
 
         let chunks = peer_store
-            .read()
-            .await
             .get_chunks_with_proof_by_tx_and_index_range(tx_seq, 0, chunk_count)
             .unwrap()
             .unwrap();
@@ -1350,8 +1334,6 @@ mod tests {
         );
 
         let chunks = peer_store
-            .read()
-            .await
             .get_chunks_with_proof_by_tx_and_index_range(tx_seq, 0, chunk_count)
             .unwrap()
             .unwrap();
@@ -1395,8 +1377,6 @@ mod tests {
         );
 
         let chunks = peer_store
-            .read()
-            .await
             .get_chunks_with_proof_by_tx_and_index_range(tx_seq, 0, 1024)
             .unwrap()
             .unwrap();
@@ -1575,7 +1555,7 @@ mod tests {
     fn create_controller(
         task_executor: TaskExecutor,
         peer_id: Option<PeerId>,
-        store: Arc<RwLock<LogManager>>,
+        store: Arc<LogManager>,
         tx_id: TxID,
         num_chunks: usize,
     ) -> (SerialSyncController, UnboundedReceiver<NetworkMessage>) {
diff --git a/node/sync/src/service.rs b/node/sync/src/service.rs
index 148d2b0..b6bd198 100644
--- a/node/sync/src/service.rs
+++ b/node/sync/src/service.rs
@@ -129,7 +129,7 @@ impl SyncService {
     pub async fn spawn(
         executor: task_executor::TaskExecutor,
         network_send: mpsc::UnboundedSender<NetworkMessage>,
-        store: Arc<RwLock<dyn LogStore>>,
+        store: Arc<dyn LogStore>,
         file_location_cache: Arc<FileLocationCache>,
         event_recv: broadcast::Receiver<LogSyncEvent>,
     ) -> Result<SyncSender> {
@@ -148,7 +148,7 @@ impl SyncService {
         config: Config,
         executor: task_executor::TaskExecutor,
         network_send: mpsc::UnboundedSender<NetworkMessage>,
-        store: Arc<RwLock<dyn LogStore>>,
+        store: Arc<dyn LogStore>,
         file_location_cache: Arc<FileLocationCache>,
         event_recv: broadcast::Receiver<LogSyncEvent>,
     ) -> Result<SyncSender> {
@@ -723,8 +723,8 @@ mod tests {
         runtime: TestRuntime,
 
         chunk_count: usize,
-        store: Arc<RwLock<LogManager>>,
-        peer_store: Arc<RwLock<LogManager>>,
+        store: Arc<LogManager>,
+        peer_store: Arc<LogManager>,
         txs: Vec<Transaction>,
         init_data: Vec<u8>,
 
@@ -913,8 +913,6 @@ mod tests {
 
                         runtime
                             .peer_store
-                            .read()
-                            .await
                             .validate_range_proof(0, &response)
                             .expect("validate proof");
                     }
@@ -1186,10 +1184,7 @@ mod tests {
             .unwrap();
 
         thread::sleep(Duration::from_millis(1000));
-        assert_eq!(
-            store.read().await.get_tx_by_seq_number(tx_seq).unwrap(),
-            None
-        );
+        assert_eq!(store.get_tx_by_seq_number(tx_seq).unwrap(), None);
         assert!(network_recv.try_recv().is_err());
     }
 
@@ -1205,18 +1200,13 @@ mod tests {
             .unwrap();
 
         thread::sleep(Duration::from_millis(1000));
-        assert!(runtime
-            .peer_store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
+        assert!(runtime.peer_store.check_tx_completed(tx_seq).unwrap());
         assert!(runtime.network_recv.try_recv().is_err());
     }
 
-    async fn wait_for_tx_finalized(store: Arc<RwLock<LogManager>>, tx_seq: u64) {
+    async fn wait_for_tx_finalized(store: Arc<LogManager>, tx_seq: u64) {
         let deadline = Instant::now() + Duration::from_millis(5000);
-        while !store.read().await.check_tx_completed(tx_seq).unwrap() {
+        while !store.check_tx_completed(tx_seq).unwrap() {
             if Instant::now() >= deadline {
                 panic!("Failed to wait tx completed");
             }
@@ -1238,12 +1228,7 @@ mod tests {
 
         receive_dial(&mut runtime, &sync_send).await;
 
-        assert!(!runtime
-            .store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
+        assert!(!runtime.store.check_tx_completed(tx_seq).unwrap());
 
         assert!(!matches!(
             sync_send
@@ -1313,12 +1298,7 @@ mod tests {
 
         receive_dial(&mut runtime, &sync_send).await;
 
-        assert!(!runtime
-            .store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
+        assert!(!runtime.store.check_tx_completed(tx_seq).unwrap());
 
         receive_chunk_request(
             &mut runtime.network_recv,
@@ -1368,13 +1348,8 @@ mod tests {
 
         receive_dial(&mut runtime, &sync_send).await;
 
-        assert!(!runtime
-            .store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
-        assert!(!runtime.store.read().await.check_tx_completed(0).unwrap());
+        assert!(!runtime.store.check_tx_completed(tx_seq).unwrap());
+        assert!(!runtime.store.check_tx_completed(0).unwrap());
 
         receive_chunk_request(
             &mut runtime.network_recv,
@@ -1460,12 +1435,7 @@ mod tests {
 
         receive_dial(&mut runtime, &sync_send).await;
 
-        assert!(!runtime
-            .store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
+        assert!(!runtime.store.check_tx_completed(tx_seq).unwrap());
 
         receive_chunk_request(
             &mut runtime.network_recv,
@@ -1503,12 +1473,7 @@ mod tests {
 
         receive_dial(&mut runtime, &sync_send).await;
 
-        assert!(!runtime
-            .store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
+        assert!(!runtime.store.check_tx_completed(tx_seq).unwrap());
 
         receive_chunk_request(
             &mut runtime.network_recv,
@@ -1589,12 +1554,7 @@ mod tests {
 
         receive_dial(&mut runtime, &sync_send).await;
 
-        assert!(!runtime
-            .store
-            .read()
-            .await
-            .check_tx_completed(tx_seq)
-            .unwrap());
+        assert!(!runtime.store.check_tx_completed(tx_seq).unwrap());
 
         assert!(!matches!(
             sync_send
@@ -1620,7 +1580,7 @@ mod tests {
     async fn receive_chunk_request(
         network_recv: &mut UnboundedReceiver<NetworkMessage>,
         sync_send: &SyncSender,
-        peer_store: Arc<RwLock<LogManager>>,
+        peer_store: Arc<LogManager>,
         init_peer_id: PeerId,
         tx_seq: u64,
         index_start: u64,
@@ -1654,8 +1614,6 @@ mod tests {
                     };
 
                     let chunks = peer_store
-                        .read()
-                        .await
                         .get_chunks_with_proof_by_tx_and_index_range(
                             tx_seq,
                             req.index_start as usize,
diff --git a/node/sync/src/test_util.rs b/node/sync/src/test_util.rs
index 4fd04f5..ce0fdaa 100644
--- a/node/sync/src/test_util.rs
+++ b/node/sync/src/test_util.rs
@@ -17,8 +17,8 @@ use tokio::sync::RwLock;
 pub fn create_2_store(
     chunk_count: Vec<usize>,
 ) -> (
-    Arc<RwLock<LogManager>>,
-    Arc<RwLock<LogManager>>,
+    Arc<LogManager>,
+    Arc<LogManager>,
     Vec<Transaction>,
     Vec<Vec<u8>>,
 ) {
@@ -37,12 +37,7 @@ pub fn create_2_store(
         offset = ret.2;
     }
 
-    (
-        Arc::new(RwLock::new(store)),
-        Arc::new(RwLock::new(peer_store)),
-        txs,
-        data,
-    )
+    (Arc::new(store), Arc::new(peer_store), txs, data)
 }
 
 fn generate_data(
@@ -115,7 +110,7 @@ pub mod tests {
 
     impl Default for TestStoreRuntime {
         fn default() -> Self {
-            let store = Arc::new(RwLock::new(Self::new_store()));
+            let store = Arc::new(Self::new_store());
             Self::new(store)
         }
     }
@@ -125,7 +120,7 @@ pub mod tests {
             LogManager::memorydb(LogConfig::default()).unwrap()
         }
 
-        pub fn new(store: Arc<RwLock<dyn LogStore>>) -> TestStoreRuntime {
+        pub fn new(store: Arc<dyn LogStore>) -> TestStoreRuntime {
             let runtime = TestRuntime::default();
             let executor = runtime.task_executor.clone();
             Self {